Is the Albinar ADG Macro Zoom lens compatible with a Nikon D80?

Albinar ADG 80-200 mm MC f3.9 Macro Zoom lens

It's probably a generic MF lens - the Nikon version will fit, but probably won't be worth the effort.

In any other mount, it won't fit.

In general zoom macros tend to combine inferior zoom performance with inferior macro performance. The $90 you could squander on this lens sets you back that much more from having enough money for something good. If you want a lens that zooms to 200mm a good value could be the 55-200mm AF-S VR Nikkor. For macro get the Micro Nikkor 60mm f2.8 AF-S or the Sigma 70mm f/2.8 EX DG macro. The latter has no internal autofocus motor, but your D80 can autofocus with it. However, if you replace the D80 with a D5200 it would not autofocus that particular Sigma lens, although a D7100 would.

LOL!

I just googled for that and found a load for sale at $20.

If you really must then be sure to get one with a Nikon mount. Image quality will be pretty dire - you don't spend $$$$$ on a camera, stick on a $20 lens and expaect good results!